Update app.py

app.py

@@ -34,11 +34,11 @@ response = load_answer(user_input)
 
 submit = st.button('Generate')  
 
-#If generate button is clicked
-if submit:
-
+# If generate button is clicked and user_input is not empty
+if submit and user_input:
+    response = load_answer(user_input)
     st.subheader("Answer:")
-
     st.write(response)
-
-# end
+elif submit:
+    st.subheader("Answer:")
+    st.write("Please enter a question.")